EP2884486B1 - Installation structure for acoustic transducer - Google Patents

Installation structure for acoustic transducer Download PDF

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Publication number
EP2884486B1
EP2884486B1 EP14197139.0A EP14197139A EP2884486B1 EP 2884486 B1 EP2884486 B1 EP 2884486B1 EP 14197139 A EP14197139 A EP 14197139A EP 2884486 B1 EP2884486 B1 EP 2884486B1
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EP
European Patent Office
Prior art keywords
movable unit
restricting
magnetic
acoustic transducer
vibrated body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14197139.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2884486A2 (en
EP2884486A3 (en
Inventor
Kenta Ohnishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamaha Corp
Original Assignee
Yamaha Corp
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Filing date
Publication date
Application filed by Yamaha Corp filed Critical Yamaha Corp
Publication of EP2884486A2 publication Critical patent/EP2884486A2/en
Publication of EP2884486A3 publication Critical patent/EP2884486A3/en
Application granted granted Critical
Publication of EP2884486B1 publication Critical patent/EP2884486B1/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/46—Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/32—Constructional details
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/22—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using electromechanically actuated vibrators with pick-up means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering
    • H04R9/043—Inner suspension or damper, e.g. spider

Definitions

  • the present invention relates to an installation structure for an acoustic transducer configured to operate in accordance with an audio signal for thereby vibrating a vibrated body so as to permit the vibrated body to generate sounds.
  • a keyboard musical instrument is provided with: the acoustic transducer fixed to a back post via a support member; and a movable unit connected to a soundboard that functions as the vibrated body to be vibrated.
  • the movable unit (vibrating unit) is configured to vibrate when an electric current in accordance with the audio signal is supplied to a coil. The vibration of the movable unit is transmitted to the soundboard, so that the soundboard is vibrated to thereby generate sounds.
  • WO 90/03025 discloses a device for radiating sounds by means of a plate-shaped, electrodynamically activated sound unit having an even or slightly curved design, in the manner of the single-layer or multi-layer sound board of a musical instrument.
  • the soundboard constitutes the baffle of the at least one electromagnetic lound speaker.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 04-500735
  • a bobbin around which a coil is wound is disposed so as to be spaced apart from a bottom yoke and a top plate that constitute a magnetic-path forming portion to leave a very narrow space therebetween.
  • the bobbin functioning as a part of the movable unit is supported by a damper so as to be movable in a vibration direction while a movement of the bobbin in the horizontal direction perpendicular to the vibration direction is restricted by the damper.
  • the movable unit If the movable unit is inclined or displaced in the horizontal direction against the restriction force by the damper, the movable unit and the magnetic-path forming portion would physically interfere with each other or electromagnetic coupling therebetween would fail, causing operation failure of the movable unit. In this instance, there may be a risk that the vibration is not appropriately transmitted or sounds are not appropriately generated. That is, the function of the acoustic transducer to vibrate the vibrated body cannot be maintained. In addition, the interference between the bobbin or the coil and the bottom yoke or the top plate would cause not only noise but also damage in those components.
  • the inclination of the movable unit and the displacement of the movable unit in the horizontal direction may be caused by buckling or flexure of a drive shaft that is caused when a drive force is transmitted. That is, a rod-like drive shaft that extends from the movable unit for driving the vibrated body such as a soundboard tends to suffer from bucking or flexure especially when the drive shaft is long and thin and accordingly does not have sufficient rigidity.
  • the inclination of the movable unit and the displacement of the movable unit in the horizontal direction may be caused due to changes over time. That is, the vibrated body such as the soundboard may suffer from a dimensional change or deformation over time due to influences of the temperature and the humidity.
  • the vibrated body or a flange to which the movable unit is connected is displaced in the horizontal direction
  • the distal end portion of the movable unit is displaced in the horizontal direction together with the flange.
  • the portion of the movable unit near the magnetic-path forming portion tends to be inclined or displaced in the horizontal direction.
  • the present invention has been developed to solve the conventionally experienced problems. It is therefore an object of the invention to provide an installation structure for an acoustic transducer that enables a movable unit to accurately move in a vibration direction and thus ensures appropriate electromagnetic coupling between a magnetic-path forming portion and an electromagnetic coupling portion for maintaining an appropriate vibrating function of the acoustic transducer.
  • an installation structure for an acoustic transducer (50) configured to operate in accordance with an audio signal for thereby vibrating a vibrated body (7) in a first direction, so as to permit the vibrated body to generate sounds, comprising: a magnetic-path forming portion (52) fixedly disposed relative to a fixedly supporting portion (9) and forming a magnetic path; a movable unit (100) having an electromagnetic coupling portion (EM) electromagnetically coupled to the magnetic-path forming portion, the movable unit being configured to vibrate in the first direction when the electromagnetic coupling portion is driven by the magnetic-path forming portion in response to a drive signal based on the audio signal; a connector (110) fixed to the vibrated body, the connector connecting the movable unit to the vibrated body for transmitting vibration of the movable unit to the vibrated body; and at least two restricting mechanisms (130, 53) fixedly disposed relative to the fixedly supporting portion and configured to restrict
  • two of the at least two restricting mechanisms may engage the movable unit (100) at mutually different positions in the first direction.
  • At least one of the at least two restricting mechanisms may be a damper (53).
  • two of the at least two restricting mechanisms may include: a first restricting mechanism (53); and a second restricting mechanism (130) that engages the movable unit at a position in the first direction at which the second restricting mechanism is closer to the vibrated body than the first restricting mechanism is to the vibrated body.
  • the second restricting mechanism may be fixed to the fixedly supporting portion via the magnetic-path forming portion, the second restricting mechanism having a holding portion (131; 133; 524) that extends to a position in the first direction at which the holding portion is closer to the vibrated body than the first restricting mechanism is to the vibrated body and an engaging portion (132; 130) held by the holding portion and engaging the movable unit.
  • each of the at least two restricting mechanisms may engage the movable unit at a position in the first direction at which each of the at least two restricting mechanisms is closer to the magnetic-path forming portion than to the vibrated body.
  • At least one (130) of the at least two restricting mechanisms may have an engaging portion (132) formed of a fiber member or an elastic member and configured to restrict, by contacting the movable unit, the movement of the movable unit in the second direction that intersects the first direction.
  • the installation structure for the acoustic transducer constructed as described above may further comprise at least one permission mechanism (K, K1, K2, K3) provided on at least one of the movable unit and the connector, the at least one permission mechanism being disposed between: the vibrated body; and the closest engaging position that is the closest to the connector among engaging portions at which the at least two restricting mechanisms respectively engage the movable unit.
  • the at least one permission mechanism may be configured to permit at least a portion of the movable unit located on one of opposite sides of the closest engaging portion nearer to the connector to incline with respect to the first direction when the connector is displaced relative to the fixedly supporting portion within a predetermined range.
  • the reference numerals in the brackets attached to respective constituent elements in the above description correspond to reference numerals used in the following embodiment and modified examples to identify the respective constituent elements.
  • the reference numerals attached to each constituent element indicates a correspondence between each element and its one example, and each element is not limited to the one example.
  • FIG. 1 shows a keyboard musical instrument in the form of a grand piano 1 as one example of devices and musical instruments to which is applied an installation structure for an acoustic transducer according to one embodiment of the invention.
  • the acoustic transducer is configured to operate in accordance with an audio signal for thereby vibrating a vibrated body, so as to permit the vibrated body to generate sounds.
  • a soundboard 7 is illustrated as one example of the vibrated body to be vibrated.
  • the devices to which the present installation structure is applied is not limited to the grand piano 1 and the vibrated body is not limited to the soundboard 7. That is, the invention is applicable to any structure in which the acoustic transducer is driven in accordance with a drive signal based on the audio signal and the vibrated body is thereby vibrated for generating sounds.
  • the grand piano 1 has a keyboard and pedals 3 on its front side.
  • the keyboard has a plurality of keys 2 that are operated by a performer (user) for performance.
  • the grand piano 1 further has a controller 10 having an operation panel 13 on its front surface portion and a touch panel 60 provided on a music stand. User's instructions can be input to the controller 10 by a user's operation on the operation panel 13 and the touch panel 60.
  • FIG. 2 In the cross-sectional view of Fig. 2 showing an internal structure of the grand piano 1, structures provided for each of the keys 2 are illustrated focusing on one key 2, and illustration of the structures for other keys 2 is omitted.
  • a key drive unit 30 is provided below a rear end portion of each key 2 (i.e., on a rear side of each key 2 as viewed from the user who plays the piano 1 on the front side of the piano 1).
  • the key drive unit 30 drives the corresponding key 2 using a solenoid.
  • Strings 5 and hammers 4 are provided so as to correspond to the respective keys 2.
  • the corresponding hammer 4 pivots via an action mechanism (not shown), so as to strike the string(s) 5 provided for the key 2.
  • a damper 8 moves in accordance with a depression amount of the key 2 and a step-on amount of a damper pedal among the pedals 3, such that the damper 8 is placed in a non-contact state in which the damper 8 is not in contact with the string(s) 5 or in a contact state in which the damper 8 is in contact with the string(s) 5.
  • a stopper 40 operates when a string-striking preventive mode is set in the controller 10. More specifically, the stopper 40 stops an upward movement of the corresponding damper 4 to strike the string(s) 5, thereby preventing the string(s) 5 from being struck by the hammer 4.
  • Key sensors 22 are provided for the respective keys 2. Each key sensor 22 is disposed below the corresponding key 2 to output, to the controller 10, a detection signal in accordance with the behavior of the corresponding key 2.
  • Hammer sensors 24 are provided for the respective hammers 4. Each hammer sensor 24 outputs, to the controller 10, a detection signal in accordance with the behavior of the corresponding hammer 4.
  • Pedal sensors 23 are provided for the respective pedals 3. Each pedal sensor 23 outputs, to the controller 10, a detection signal in accordance with the behavior of the corresponding pedal 3.
  • the controller 10 includes a CPU, a ROM, a RAM, a communication interface, and so on.
  • the CPU executes control programs stored in the ROM for enabling the controller 10 to perform various controls.
  • the soundboard 7 is a wooden plate-shaped member, and soundboard ribs 75 and bridges 6 are attached to the soundboard 7.
  • the strings 5 stretched under tension partially engage the bridges 6.
  • vibration of the soundboard 7 is transmitted to the strings 5 via the bridges 6 while vibration of the strings 5 is transmitted to the soundboard 7 via the bridges 6.
  • acoustic transducers 50 are connected to the soundboard 7 such that each acoustic transducer 50 is supported by a corresponding support member 55 connected to a back post 9 as one example of a fixedly supporting portion.
  • Each support member 55 is formed of metal such as an aluminum material.
  • the back posts 9 cooperate with a frame to support the tension of the strings 5 and constitute a part of the grand piano 1.
  • Fig. 3 is a view showing a back surface of the soundboard 7 for explaining positions at which the acoustic transducers 50 are installed.
  • Each acoustic transducer 50 is connected to the soundboard 7 and is disposed between adjacent two of a plurality of soundboard ribs 75 attached to the soundboard 7.
  • a plurality of, e.g., two acoustic transducers 50 having the same structure are connected to the soundboard 7. Only one acoustic transducer 50 may be connected to the soundboard 7.
  • Each acoustic transducer 50 is disposed at a position as close as possible to the bridge 6. In the present embodiment, the acoustic transducer 50 is disposed at a position of the back surface of the soundboard 7 at which the acoustic transducer 50 is opposed to the bridge 6 with the soundboard 7 interposed therebetween.
  • a left-right direction, a front-rear direction, and an up-down (vertical) direction as viewed from a performer's side of the grand piano 1 are respectively referred to as "X-axis direction", "Y-axis direction” and "Z-axis direction”.
  • the Z-axis direction is one example of a first direction.
  • the X-axis direction and the "Y-axis direction (X-Y direction) correspond to the horizontal direction.
  • the X-Y direction is one example of a second direction.
  • Fig. 4 is a vertical cross-sectional view of the acoustic transducer 50.
  • the acoustic transducer 50 is an actuator of a voice-coil type and is mainly constituted by a magnetic-path forming portion 52 and a movable unit (vibrating unit) 100.
  • the movable unit 100 includes a rod portion 101, a cap 512, a bobbin 511, and a voice coil 513.
  • the bobbin 511 having an annular shape is fixedly fitted on a lower portion of the cap 512.
  • the voice coil 513 is constituted by conductor wires wound around the outer circumferential surface of the bobbin 511.
  • the voice coil 513 converts, into vibration, changes in an electric current flowing in a magnetic field formed by the magnetic-path forming portion 52.
  • the cap 512, the bobbin 511 and the voice coil 513 constitute an electromagnetic coupling portion EM that is electromagnetically coupled to the magnetic-path forming portion 52.
  • a lower end portion, namely, a first end portion 101a, of the rod portion 101 is fixedly connected to the cap 512 of the electromagnetic coupling portion EM, and the rod portion 101 extends in the Z-axis (vertical) direction.
  • a second-end-portion connector 110 is fixed to a lower (back) surface of the soundboard 7.
  • the second-end-portion connector 110 connects an upper end portion, namely, a second end portion 101b, of the rod portion 101 to the soundboard 7 so as to transmit vibration of the movable unit 100 to the soundboard 7.
  • the second-end-portion connector 110 has a ball joint structure having a pointer member 111 and a chuck member 112.
  • a spherical portion 102 is formed at the second end portion 101b of the rod portion 101.
  • the pointer member 111 is fixed to the soundboard 7 by a screw 103, and the chuck member 112 is fixed, at its flange, to the pointer member 111 by screws 103.
  • the spherical portion 102 of the rod portion 101 is disposed between a tapered surface 111a of the pointer member 111 and a tapered surface 112a of the chuck member 112.
  • the chuck member 112 is fixedly fastened to the pointer member 111, whereby the position of the spherical portion 102 in the Z-axis direction is determined or defined by the tapered surface 111a and the tapered surface 112a.
  • the spherical portion 102 can accordingly rotate about an axis perpendicular to the Z axis (e.g., the X axis or the Y axis) in the tapered surfaces 111a, 112a.
  • the second-end-portion connector 110 and the spherical portion 102 constitute a permission mechanism K.
  • the vibration direction means a direction in which the movable unit 100 vibrates.
  • the permission mechanism K is one example of a mechanism for permitting at least a portion of the movable unit 100 that is near the second-end-portion connector 110, mainly the second end portion 101b to be inclined with respect to the Z-axis direction when the second-end-portion connector 110 is displaced relative to the back post 9 within a predetermined range. That is, the permission mechanism K functions as a joint portion that permits the second end portion 101b to rotate about any axis perpendicular to the Z axis while the spherical portion 102 serves as a pivot center.
  • the second end portion 101b can be inclined relative to an axis C1 corresponding to the Z axis owing to bending at the permission mechanism K.
  • the motion that causes bending at the permission mechanism K is substantially a pivotal motion.
  • the rod portion 101 is formed of metal, for instance. While the pointer member 111 and the chuck member 112 are formed of resin, for instance, those members 111 112 may be formed of metal.
  • the magnetic-path forming portion 52 includes a top plate 521, a magnet 522, and a yoke 523 that are arranged in this order from the upper side.
  • the electromagnetic coupling portion EM is supported by a damper 53 (as one example of a first restricting mechanism) such that the electromagnetic coupling portion EM can be displaced in the Z-axis direction without contacting the magnetic-path forming portion 52.
  • the damper 53 is formed of fiber or the like and has a disc-like shape.
  • the damper 53 has a waved shape like bellows at its disc-like portion.
  • the damper 53 is attached at its outer peripheral end to the upper surface of the top plate 521 and at its inner peripheral end to the electromagnetic coupling portion EM.
  • the magnetic-path forming portion 52 is fixedly disposed relative to the back post 9 such that the yoke 523 is fixed to the support member 55 by screws or the like, for instance. That is, the magnetic-path forming portion 52 is in a fixed state relative to the back post 9.
  • the axes of the top plate 521, the magnet 522, and the yoke 523 are aligned with one another and coincide with the axis C1 of the magnetic-path forming portion 52. This arrangement forms a magnetic path shown by arrows in the broken line in Fig. 4 .
  • the electromagnetic coupling portion EM is disposed such that the voice coil 513 is located in a space between the top plate 521 and the cylindrical portion 523F, i.e., in a magnetic-path space 525.
  • the acoustic transducer 50 has, in addition to the damper 53, a restricting mechanism 130 (as one example of a second restricting mechanism) for restricting a movement of the movable unit 100 in the Z-axis direction at an engaging position (at which the restricting mechanism 130 engages the movable unit 100) while permitting a movement of the movable unit 100 in the Z-axis direction.
  • the damper 53 and the restricting mechanism 130 are spaced apart from each other in the Z-axis direction.
  • the restricting mechanism 130 has a bridge portion 131 (as one example of a holding portion) and a contact member 132 (as one example of an engaging portion).
  • the bridge portion 131 is formed by bending a metal plate, for instance, and may have any shape in plan view. For instance, the bridge portion 131 has a circular or rectangular shape in plan view.
  • the bridge portion 131 has an outer peripheral portion 131a fixed to the top plate 521 and an inner peripheral portion formed to extend upward by burring so as to provide a holding portion 131b.
  • the bridge portion 131 is fixed to the back post 9 via the magnetic-path forming portion 52 and extends to a position in the Z-axis direction at which the bridge portion 131 is closer to the soundboard 7 than the damper 53 is to the soundboard 7.
  • the contact member 132 fixed to the holding portion 131b restricts the movement of the movable unit 100 in a direction intersecting the Z axis at a position in the Z-axis direction at which the contact member 132 is closer to the soundboard 7 than the damper 53 is to the soundboard 7.
  • the damper 53 and the restricting mechanism 130 engage the movable unit 100 at mutually different positions in the Z-axis direction.
  • the contact member 132 having an annular shape is bonded to an inner diameter portion 131c of the holding portion 131b.
  • the rod portion 101 of the movable unit 100 passes through a through-hole of the contact member 132.
  • the electromagnetic coupling portion EM is positioned relative to the horizontal direction, i.e., the X-Y direction, by the damper 53 and the restricting mechanism 130 such that an axis C2 of the rod portion 101 that coincides with the axis of the movable unit 100 aligns with the axis C1 of the magnetic-path forming portion 52. Consequently, the damper 53 and the restricting mechanism 130 cooperate with each other to support the magnetic-path forming portion 52 such that the movable unit 100 is movable in the Z-axis direction that coincides with the vibration direction while the axis (C2) of the movable unit 100 is kept aligned with the axis C1 of the magnetic-path forming portion 52.
  • the contact member 132 functions as a bushing for preventing the rod portion 101 from moving in the horizontal direction at a position near the cap 512.
  • the position in the Z-axis direction at which the contact member 132 engages the movable unit 100 is sufficiently closer to the magnetic-path forming portion 52 than to the soundboard 7.
  • a drive signal based on an audio signal is input from the controller 10 to the acoustic transducer 50.
  • audio data stored in a storage portion (not shown) is read out by the controller 10, and the drive signal is generated on the basis of the read data.
  • the controller 10 When the soundboard 7 is vibrated in accordance with a performance operation, the behaviors of the keys 2, the pedals 3, and the hammers 4 are detected respectively by the key sensors 22, the pedal sensors 23, and the hammer sensors 24, whereby the performance operation of the player is detected.
  • the controller 10 On the basis of the detection results, the controller 10 generates performance information.
  • the controller 10 subsequently generates an acoustic signal on the basis of the performance information.
  • the acoustic signal is processed and amplified so as to be output to the acoustic transducer 50 as the drive signal.
  • the voice coil 513 When the drive signal is input to the voice coil 513, the voice coil 513 receives a magnetic force in the magnetic-path space 525, and the bobbin 511 receives a drive force in the Z-axis direction in accordance with the waveform indicated by the drive signal input to the voice coil 513. Consequently, the electromagnetic coupling portion EM is driven by the magnetic-path forming portion 52, so that the movable unit 100 (the electromagnetic coupling portion EM and the rod portion 101) vibrates in the Z-axis direction.
  • the vibration of the movable unit 100 is transmitted to the soundboard 7 by the second-end-portion connector 110, so that the soundboard 7 is vibrated and sounds generated by the vibration of the soundboard 7 are emitted in the air.
  • the contact member 132 is formed of a soft fiber member such as a felt or a cloth.
  • the contact member 132 is formed of a soft fiber material, it is possible to reduce noise generated by friction between the contact member 132 and the rod portion 101.
  • the contact member 132 may be formed of resin or the like, and a portion thereof that contacts the rod portion 101 may be formed to have low surface roughness, for reducing the friction.
  • the contact member 132 may be formed of an elastic member such as rubber.
  • the contact member 132 may be arranged not to be always held in a sliding contact with the rod portion 101 that is vibrating but to be always held in a close contact with the rod portion 101 that is vibrating.
  • the amplitude of the vibration of the movable unit 100 is not so large.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP14197139.0A 2013-12-11 2014-12-10 Installation structure for acoustic transducer Active EP2884486B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2013255848A JP6146289B2 (ja) 2013-12-11 2013-12-11 加振器の取付構造

Publications (3)

Publication Number Publication Date
EP2884486A2 EP2884486A2 (en) 2015-06-17
EP2884486A3 EP2884486A3 (en) 2015-08-05
EP2884486B1 true EP2884486B1 (en) 2019-01-30

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EP14197139.0A Active EP2884486B1 (en) 2013-12-11 2014-12-10 Installation structure for acoustic transducer

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US (1) US9591400B2 (ja)
EP (1) EP2884486B1 (ja)
JP (1) JP6146289B2 (ja)
CN (1) CN104715745B (ja)

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JP6442854B2 (ja) * 2014-04-09 2018-12-26 ヤマハ株式会社 加振器の取付構造、及び、楽器
JP6446896B2 (ja) * 2014-08-01 2019-01-09 ヤマハ株式会社 加振器の取付構造、及び、楽器
JP6378590B2 (ja) * 2014-09-09 2018-08-22 株式会社河合楽器製作所 電子楽器
JP6652358B2 (ja) * 2015-09-29 2020-02-19 株式会社河合楽器製作所 電子ピアノの響板スピーカ
JP6939254B2 (ja) * 2017-08-25 2021-09-22 ヤマハ株式会社 楽器
JP7230441B2 (ja) * 2018-11-09 2023-03-01 ヤマハ株式会社 加振ユニット、楽器
JP7243475B2 (ja) * 2019-06-17 2023-03-22 ヤマハ株式会社 加振装置、楽器

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US20150163575A1 (en) 2015-06-11
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EP2884486A2 (en) 2015-06-17
CN104715745B (zh) 2018-06-22
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CN104715745A (zh) 2015-06-17
US9591400B2 (en) 2017-03-07

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